Speaker
Description
Experimental advanced superconducting tokamak (EAST) is a D-shaped full superconducting tokamak device. Plasma facing components (PFCs) of divertor are most likely to be damaged during the operation, which become failure easily and have to be replaced and repaired frequently. To be able to reach the design objective, an assessment of technical risks by means of RAMI (Reliability, Availability, Maintainability and Inspectability) of the PFCs has to be performed on the graphite tiles as examples.
A functional breakdown of the graphite tiles was performed in a bottom-up approach, which are described using the IDEFØ method. Reliability block diagrams (RBDs) were prepared to calculate the reliability and availability of each function under stipulated operating conditions. Failure Mode, Effects and Criticality Analysis (FMECA) of the graphite tiles was performed to evaluate potential causes of failures and their consequences. Criticality charts highlight the risks of the different failure modes with regard to the probability of their occurrence and impact on operations. It was assessed that the RAMI analysis results meet the EAST project requirement during this design phase and the result will be qualified further when the device is updated.
| Eligible for student paper award? | No |
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